What if Honda had really pushed the 2 stroke? Also Nigel is right - apart from the engine, the Mont and especially the Sherco are much the same as before.
Fudamentally the bikes today are the same as the Beta Zero of the early nineties. They have certainly evolved a lot since then, BUT had alloy perimeter frame, disc brakes, watercooling, monoshock etc. I would guess that the Zero engine weighed less than the new 4s and certainly had smaller dimensions.
I remember riding a mono Yam for the first time when they were new and compared to my Cota 348 or a current 340 Bulto it felt massively different. Does the new Mont feel that different to the 315? - not according to Sunt.
Where is the next big step coming from?